I get the sense that over the past 10 years or so, it has become increasingly frequent to see someone assault another person with a weapon and then take his own life. I'm thinking here of massacres that occurred in the United States, or situations like the one experienced by Ms. Irons and many others. I may not have grasped the scope of this problem at the time, but it seems to me it was far less frequent 15 years ago. Now, it's almost systematic; people hurt others before they take their own lives.
What is the operative process there which we should understand, and how does it evolve?